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Dec. 20, 1927. L 1,653,443

E. B. THURSTON CONTROLLER FOR ELECTRIC ELEVATORS Filed Nov. 19. 1926 35' gnuentot Em est .8. Th u/m: on

@M am Gum 4:114.

Patented Dec. 20, 1927.

* UNITED STATES ERNEST B. THURSTON, or TOLEDO, 01110, ASSIGNOR TO THE HAUGHTON Emma): '&

MACHINE COMPANY, OF TOLEDO onto; A-CORPORATION. 01 OHIO CONTROLLER FOR nLnocrnionnnvnronss Application filed novemb'e'r This invention relates to installations for elevators operated by polyphase alternating current motors.

More particularly, the invention relates to the method of (lo-energizing the high speed motor, or the high speed winding of a multispeed motor.

Inyorder that the inventionmay be clearly understood, it is described in connection with fairly complete details of one installation in which it may be used, satisfactorily. The accompanying drawing, forming a part of this specification isanacross' the line diagram of an installation in which the invention is incorporated.- V 7 In the installation shown, there are three a power lines 11,- 12 and 13,Ifrom .which the three-phase low speed windings the similar high speed windings H are i thesebeing the windings which drive an elevator at low and high speeds, respectively."

The connections willv be describedsubstantially in the order in which the circuits are energized when the elevator, is started.

A line ll is connected to the power and leads through a safety resistance l5 to terminals 16and 17; 'A car, switch g 18 is,

adapted to connect terminals 16; andl'] with other terminals, as will be;.;described \Vhen switch 18 is moved in'one direction,

it connects terminal 16 with aterm-inalglt) connected by ,a-'.line 20 to; a; line 21; leading z. P through a magnetic coil, 22,'to a line 23 con-l nected with power line ,Magnetie coil f 22 actuates any suitable means 24:;forclosing a number of switches, which will be described later. However, no other operation of ,the.

apparatus takes place because of this preliminary connection.

Further movement of switch-18in the; l

line 63, line .13. Phase' 61 is connected same direction results in connecting, terminal 16 with a terminal 27, from whicha1line.28 leads to one phase 29 of a direction switch operating motor A. This connects phase 29 to power line 12. Theother phases,.,30 and 31, or" motor A are connected respectively to power lines 13 and 11. Phase 30 is constantly connected to line 1-3 by a line 32, while phase 31 is connected by means of a line 33 to a terminal 34. j

A line 35 leads from line 11 through safety resistance 36 to line 37 branching to termi- 39, car switch isj 'connected to move inf unlsonj with switch'j 18. lVhen hTlS s moved t6 connectter 'n ijl' vlg'ls phases of mtor A are" connectedftotlie res ega power lines") d the filter is ener- A, "over i inei t b '12 Fahd has" a'iliranch' M doniiected to "Eline ormallyfpp'eii switch 50.

w na iei f ee-l sen? i abo v 11 gthrpgipha s 'ofithe a e r peat d. r thf heinr hn esie th i T ,Spiectiylej pow'e' 19351 115 I j-- The low s'peed win ding'L comprises; phases 60, 61.an d,6 Phase isFconnected by a bye use 64to"1iiie 49. Phase.62 is cqnmted .by a hne 65 to line 45'. IFroin'it; will 45 .andQfiO v a e; closed all three: phases of winding 'L are connectedto,thfir respective power .li ne s; and the motor is. operated to raise the-elevatorQ '1 I A motor B having phasesfiti, 67 and 68 is provided for cutting out thewa'cceleration means of winding vL. Phase 66, is connected by line 66 with 'line63. Phase 67 is con- J "wi cU-ki'l', 1:. w ener to, lose umdirectlon a be seen f that, I when up-direction lUU 1'1 respect 1 'rettiin's' the low fspeed"acceleration device to 'startingpositiom assay nected by a line with line 49. Phase 68 is connected byline 69 to line (55 Therefore, inoto'r B isenergized"whn iipflirection switches 46 and 50 are closed'for low speed operation.

The acceleration means of motor-L is shown aseonsisting: of. resistance :coils :71, 72 and 73 which may becut out by closing switches 74 and 75; rSi's'tancet iiIs' 'IQ W- and 78, which may be cut out by closing switches 79 and 80; and res'istanc'e'coil's 81', 82 and 83 which may h cut out by closing slwitehe's 84 and '85. Pifferiiblyftheie are also resistance coils 86; 87 88 which are permanently inserted in their respcti'v'e is i.,'p 'v 'di for re berries When switch 13 is n'iot ed' @3036; contact 27, it cbii'iieiseoiittt arm-r contact 1's.

7 Contact 92, is connected .b a -1ine,93" ii ith 'pha'se 89 of 1136130316.; P met 90" Tbf rrfiotor C scbnng iiin; which 152 of'tli'e btaflfeiri'ag ret. fl hfase liofimotor c istens-dean 14 1. .1 it wit-'53 Mitten iiir seff ji unheated r 1 1 e i iw 104, and a s milar norm al l "closed switch is 'ir'ite'rpbs'ed in liiie'65 I adi'n to phase Batten-{10w speed winding. W enf lessor Gi gi e. it ewe sisii' 'ab new which opens switches1045.2ihd105and eloses sw'itclies 101 and 103, thereby 'de energiz ing low speed winding L and energizing high "speed winding H. open ng of switches 101 mid 105 'liliewise deetitilfgizes motor B'iiiiflv High speed 'wrntlingfh as" "the iisual' ac- Eeler'atidn renames, Siamherein as coils 106, 1(17 ail d. 108," which be. cutf o'ut by 'cl'o'si'fi "switches 109' and 11p; coil's '1'1'1; 112, new rich maybe-cumin by'closing switches 114. and. and. coils ll fil .'117iin'd118; which ma be cut out liyclositig switches ireifiid'isii. V A'motor Dv 'liliving .plras'es 121', 122 and 123 is provided for cutting out the high speed acceleration resistance. Phase 121 is lopen." g Q A t Tlieo pera'tion of the installation-instarte'f98 is' constantly connected through a line 124 with line 100, and so is connected to power line 13 'wliii the hi'gh speedwinding' is energi'z'ed. Phase 122 'is connected through a line 125 to a terminal 126. When switch 18 is moved to make contact with terminal 92, switch 40 is moved to connect terminal 126 with terminal 38, thereby connecting phase 122" with power line 11. Phase 123 is connectedto power line 12 by a line 127 through .1-

fthatiit first closes switch 130 by "suitable 114' and 115'- by suitable means D, 3 and s'wit'che's 119 and by means D, fmi'scatting'eut'the resistance and'fully energizing the high' speed winding.

Phase-29midirection switch motor A is' cdii'hect'd"b a line 131 to line 45.- A "s'peedgowernej"switch 132' is' interposed in Iiii'e131';"P11373631'is connected by line 133 'inteiipo'sed' in-ii-inej 133: -By-'th-is means the speed ha's' dropped to aceiftain predeterniiiied' nt," twhich' "switches: 13 2 and 13% ing the elevator will he nnderstood from the above description. I 1 fWhn it'isfdesired to slow down or' -stop tli'e'e'leyator, switch 18 is moved away from contact 92, and simultaneously switch-4t) "moi'fesaii'ayfroin contact 126. Breaking 'tl'leTOYIflBtlOliliet'ween l ne '93 and-line 12 does not have any immediate effect, :is power continues to flow through line 129 until *snvitclr'130 'is'op'ened. Breaking the connec- "tion between line and line 11 de-energizes motor D. The result of (lo-energizing ino'torD isto introduce resistance into the high-speed winding by opening-in succession-first's'witcl-ies 119 and 120; then. 114 and switch] is opened, and motor C is deenergi zed'g thereby cuttingout the high speed winding aud energizingthe low speed windi'ngqf By actiia'tihg'tlie switches in this order a'gi'hdu'al dece'lei-ation' is effected. A less gradualdeeeleration nay be effected by urranging the motorD'so'as to'open switch 130 before'the lastresistance is inserted.

If switch 18' is'let't in pos tion to connect contact 27 with the power line 12, the elevat'or 'co'n tinues 'to move at low speedij' Ifthe switch'is moved away from contact 27, direction'motor A is die-energized as soon as the speedfis sufliciently reduced to open switches132 and 134. If switches 18 and 40 are moved at once back to neutral, the starting coil '22 is de energized, thereby opening .swit'chesl56 and 58 and setting the brake. It will be seen that brake 51- may be set'at anytime the operator desires, irrespective'of whether'or n ot the elevator has slowed down enough to 'open' switches 132 M1134; I

It will be seen thatresistan'ce elements 86, 87 and 88'zire constantly'interposed in the low" speed windingfand' they are constructed. to properl'ycontrol the maximum dynamic braking action-of the low speed winding whenwinding C is de-energiz'ed."

- VYhen' it 'isjde sired to operate the elevator in the opposite; or down directionfswitch 18' is niovedtofconnect' a contact 135 with contact17ifConta ct 135 is'connected to line 21 'by'meains of, 'aline 1 36; It will be seen that coil 22 energized from" contact; 135 'in the sameitfis from contact 19;

. Furtheflmovement of switch: 18 in the "same ,direction connectsa contact 137 with Ipower f1ine 12'. Line 138. connects. 'contact Earthen mov ment jef "'swi hf;fl18 in the l same 'directi'oii toasters; a contact "139 i with powei' line 12; Contact 139 is 'con'neeted by line a a e t1m i s ease- 9:0

motor Of H At the same; time that" switeli 18 is 1 moved t e a' ge tact"141';connect'ed 5 142a) line95 when the;switch1118 ismoved toengage roni the above descripti on' it will be readily'seen that movement ofiswitches 18 and inthe last described direction energizes then a -ioiis V circuits in substantiallyL'ergizing of the motor, which is apt to result the waypreviously described, except that it'. in a noticeable jerk of the elevator. connects co'il' 29 of motor A with power line i 11 through line 144 and contact 143, inst:e ad of connecting it, to power line 12 through line 28fa'nd contact 27 and it connectscoil 31 ofirnotoriAito power linell2 throi gh line 138 and contact 137, instead of lconnectin'g' it to power. line 11 througheontact' 34. The result is that motorA actuated in the opposits direction.

Line is connected to-li'ne 47 by a line 147--through a normally open switch148, and line 49 connected to line 43 by a line 149 through a normally open switch 150.

r ii e V J p and 4:0"in' the neutral position, until switch w tch 18' is".moved to fore, changes the direction of movement of the elevator. Otherwise the successive operation of the various parts is the same as previously described.

' "Withthe construction thus far described, movement of switch 40 to a neutral position disconnects-line 95 from power line 11 and thereby: (lo-energizes high speed switch C.

cutting out the high speed winding at once,

instead of first cutting in the acceleration resistances. v

It is sometimes desirable to prevent the movement of the switch 'to neutral from c uttingout; the high speed windings with- "out 'first inserting resistance, and' for that purpose a line 151 may be provided, connecting' contact 41*to line 37 between con tact 38 and, resistance coil 36. A normally open l'switch 1521s interposed in line 151, andis connected to be closed by suit-able means A when motor'A is actuated for up direction',operation, A similar line 153 connects "contact? 141*With line 37 between -c'ontact'39' and coil 36; A normally open switch 154 15 interposedfinline153." Switch 154 is connected' to'j b'eclo sed by direction switch "motor Awhen actuatedin the down direc tion." It will be seen that with the above described"conhections motor C will con- .tinueto be ene'rgized,even with switches 18 130fb iid after the resistance has been The above described provisions for reinserting tlieresistanc'e mQthelngh speed be fore motor 0 is 'de el iergized'to shift the cur- 'rentj'to the low speed winding", is the main object of the' present invention; It will be readily understood that' this reinse'rtion or the'resistance in the high speed winding cuts off the power from that winding radually andthereby prevents a sudden'ce-ento pick up speed, an abrupt cutting out of the high speed motorresults in a much more noticeable bump than where full speed has been'attainedbefore power is cut oti'.

because less power is being applied after the elevator has attained full speed than when the speed of the elevator is being increased. Therc'iore, the above described a1 Whenthe elevator has acquired speed the reinsertion of accelerationresistancebeswitchrernains in nep t lra ,positid ping: the elevator,-

the; manner. described taet 137 with rowel-(l ne -redu e .fi 'irbt gam i O to. bwnag e temgigi evg through: line 1.3. s. 3m ;astw ehrle r -i 1 mains closed. l

through line 144. ,How'e'ver w fore the high speed winding is de-energized is unnecessary, and may be undesirable, especially where the high speed winding is acting as a, dynamic brake; \Vhere conditions are such as to warrant the-addedequipnient, a speed-controlled switch 164 may be interposed in line 129 and arrangedto open when the elevatorattains substantiallyiull speed. \Vith that arrangement, motor C is de-energized immediately when the car switch is moved from its high-speedposition, thereby changing the power connections from the high-speed to the low-speed winding without waiting for the operation of motor D and its connected switches. I V

Should opening the. cireuit tonnotor D failto open switchl th it wouldbe natural for the operator toi n ove theflcar switch to rseip it u, h ch wfi d-rs n t m i P below-.1

Supposing moving high-speed -h p dir s tionaaild th me ic rtswi-t' hesia e meted. qmslqi wdixectip posiaqna Wh n sw tc .lfiieeaeeetwifltwn- .t 11 t fi r n revfie e 1s n bdace s-coene mrit hcq atcwm i R1??? .YHE

.. the n ctic 9s'1ng'. swit'chs 104- and 105, cutting li h -put thelliigll stated? windin and energizing lens 2 h r k hih; i s h lireetion, wind ing 890i high speed switch .n otor C is energized through line 129 from line 1 2 aslong as switch 130 reinain's closed. then switch 18"is moved to connect contacts 137 and 139, winding 89 is directly connected to power line 11 through lines 93 and 140, contacts 189and 1 37, and lines 138, 33, 133, 19, 48 and 47. Inasmuch as resistance 15 is interposed in the connection of winding 89 to line '12, and there is no resistance interposed between winding 89 and line 11, the winding is energized from line 11 instead of from line 12, with the switches in the above described position.

\Vith switch to in its up-direction, winding 91 of high'speediswitch motor C is cner gized from line 11, and continues to be so energised as long, as switch 152 is closed.

When; switch 40 is moved to connect con- ,taets 1 41 and 1 13, winding 91 is connected to vpower line. 12 through lines 95, 142, contacts @141 1111143., and lines 1 14,131, 45, 44 and 13, as iongas speed-control switch 132 r'ernain s closed; resistance 36 isinterposed nth connect on of w nding 91 'to power line 1' whereas the'conne'cti'on to power line l2 iswithout interposed resistance, winding i s- -ener], ii zed from power line 12 instead -Q I power. ne,11..; The connections of windings QQ and 9], being tliu'snte'versed, motor C from eif ergi z'e d toiiioveitfba'ck tenor-m1 posiign there lifoperiii gswitches 101- and 103 car; sw tch, is move 'lH-P d when 'niiiitrial "the law" speed winding. The low speed windr. th t.

in -1ft, coii t lifef lit-AW- fiht a e? PM becomes, conneeted, thr9pgl1 lip' I t, 1,2 it-it "1 1 co n t d th g l 1 3. fan, line J th' t motor; it is connec ed to ,iiiding 29 is'; also connected through line jl3l and line to power line 12 and, because pt'the intei position ofresistance' 36 'inits connect on to gized from line 12 helm-gas 'swi'tchkl32 iemains closed. Therefore, the movement '0 the car switches to reverse direction does not affect the direetion'switch 'in'oto'r'nntil after the speed has been reduced enough to open switches 131 and 133.

With the elevator operating in the up- .dirhihh's ifi i he; ft owe'r' line 11 l t'li'e jca switch is moved iiiiniediately to the fter actsvasa dyna nie brake until rolldjswitehes 132 and 134 are Whefithe e witches open, the nort e',.d ijrccioh svvitcl'i be- I tlfi'iinotor i'ijnjifnediate'ly n the down direetio'n'fif the car let-t inzit's down-direction position.

1 stallation will Ollftit to inse'rtresistanee in .9, -winding:bfiore the current is h'"' -;fi o1n that winning, at least in the 'ort dis't'ance operation of the apparatus, l accomplish this effect even when neutral position, buttha't in case of emergency, aris ng from the sticking of any of the acceleration device of the high speed I 'hillhaingfthe car-rent maybe switched from line"'ll,'"winding 29 cohumiesiio h 'e'inert e higl i speed tvinding'to the low speed wi'nd'iiigfbyniovingthecar switch to the ext'r merverse p sition. p

he same results are attained with the omission of lines 151 and 153, except that this omission of lines'151 and 153 results in cutting out the high speed winding directly when-the ear switch is moved to neutral po' lliil sition. This e cdfiiages the operatortodis regard. the objectionable bump resulting from i the sudden cutting out" (if'the high speed winding, 3 in M order to stop q 'y- Whilegthe inst-allationhasgbeen "described in connection with rotary polyphase motors for the switches, it will be understood that other equivalent devices may be substituted therefor. Y

The installation has been described in connection with two windings for difierent speeds, but it will be understood that the principle could be applied to an installation comprising a motor with a single winding having changed connections for different speeds, and to installations involving more than two speeds.

In the installation shown, the power switches 101, 103, 104 and 105 are controlled by actuating means separate from the act-uating means of the starting devices. This is a valuable safety provision.

It will be understood that suitable interlock and other safety switches will be interposed where desired. In the installation shown, switches 155 and 156 are shown interposed in lines 136 and 20 respectively, and may be operated by any suitable limit means 1. A switch 157 is shown interposed in line 21', which may be controlled from the car gate by means cg. A similar switch 157 may be interposed in line 9 1. Limit switches 158, 159, 160 and 161 may be interposed in lines 35, 95, 142 and 14A respectively. Over-speed, over-travel, and floor door switches may be interposed in line 34, as indicated diagrammatically at 162. A safety switch 163, operable by mag netic coil 22, may be interposed in line 37, if desired. 1

If line 23 were connected to line 11 in the installation shown, instead of to line 13, movement of car switch 18 to connect contacts and 37 would de-energize coil 24 as long as switches 134 and were closed and thereby'direct connections were established between line 11 and contact 37. A similar result would be produced when car switch 18 connected contacts 19 and 27 with switches 132 and 148 closed.

\Vliile I have described and illustrated the invention in the form which now seems to be the most practical, it is obvious that various additions and modifications may be made within the scope of the appended claims.

What I claim is:

1. In an electric elevator installation, an alternating current motor having high and low speed power connections, a high speed switch for the high speed power connection, a starting device for the circuit controlled by said switch, an actuator for said switch,

' a separate actuator for said device, a control switch, and connections frjom the con troljs'witch' tothe actuators operating first nae actaiator of 'th' starting-device and-there aft'i fthe swatches-rate high speedf'switch foif opening the powriconne acn, when the control switch is moved *its high speed pd rfi tminiij r'fi3gp {:1 uill-WHI E :1 UH-I. ""1 1 2. In an electric elevator installation, multi-speed electric motor means, a high speed switch for said means, a starting device for the circuit controlled by said switch, an actuator for said switch, a separate actuator for said device, a control switch, and connections from the control switch to the actuators operating first the actuator of the starting device and thereafter the actuator of the high speed switch, when the control switch is moved to one position from its high speed position, and other connections from the control switch to said actuators operating the actuator of the high speed switch immediately when the control switch is moved to another position from its high speed position to utilize said other connections.

3. In an electric elevator installation, multi-speed electric motor means, a starting device for the high s eed circuit of said means, switches contro ling said means, switch operating devices constructed to reinsert said starting device in the high speed circuit before said circuit is de-energized, and a speed-controlled device operative to avoid the reinsertion of said starting device when the high speed circuit is de-energized while the elevator is travelling at approximately maximum speed.

4. In an electric elevator installation comprising low speed and high speed circuits, starting devices for each of said circuits and a car switch, connections controlled by the car switch for normally reinserting the starting device in the high speed circuit when the car switch is moved from high speed position to neutral, and connections whereby movement of the car switch from high speed to reverse de-energizes the high speed circuit without reinserting the starting device.

5. In an electric elevator installation comprising low speed and high speed circuits, starting devices for each of said circuits and a car switch, connections controlled by the car switch for normally reinsert-ing the starting device in the high speed circuit when the car-switch is moved. from the high speed position to neutral, and a speed-controlled device operative when the elevator is travelling at approximately maximum speed to de-energize the high speed circuit without reinserting the starting device when the car switch is moved away from high speed position.

6. In an electric elevator installation comprising low speed and high speed circuits, starting devices for each of said cirwits and a car-switch, connections controlled by the car switch for normally reinserting the starting device in the high speed circuit when the carr -switch is moved from thed igli speed positiqn to neutral, and a speed-continued device pperative when the elevator is travelling at approximately maxi:

mum speed to de eii ei'gize the high speed circuit, xyithqnt reinsei'tin the starting device whenthe eer-switc is moved to ne u- 1U tral.

In testimony whereof I have hereunto signed my meme, to this specification. V y v B. THURSTON. 

